Firing up Cassandra, OpsCenter and a DataAgent locally on OS X for development. This has some presumptions like the install locations (change to suit your purposes). This also presumes these services have already been configured and run properly without resorting to this script. Add to your path and chmod a+x it.

cassandra-service

#!/bin/bash

CASSANDRA_HOME=/opt/apache/cassandra
OPSCENTER_HOME=/opt/apache/opscenter

CASS_LOG_DIR=$CASSANDRA_HOME/logs
CASS_LOGFILE=$CASS_LOG_DIR/system.log
CASS_PIDFILE=$CASSANDRA_HOME/cassandra.pid

OPSCENTER_LOGFILE=$CASS_LOG_DIR/opscenter.log

start_service() {
    if [ ! -e $CASS_LOG_DIR ]; then
        mkdir -v $CASS_LOG_DIR;
    fi

    echo -n Starting Cassandra...

    if [ -e $CASS_LOGFILE ]; then
        mv $CASS_LOGFILE $CASS_LOGFILE.`date "+%Y%m%d-%H%M%S"`
    fi

    $CASSANDRA_HOME/bin/cassandra -p $CASS_PIDFILE > $CASS_LOGFILE  2>&1

    echo OK

    echo -n Starting agent...

    $OPSCENTER_HOME/agent/bin/datastax-agent

    echo OK

    if [ -e $OPSCENTER_LOGFILE ]; then
        mv $OPSCENTER_LOGFILE $OPSCENTER_LOGFILE.`date "+%Y%m%d-%H%M%S"`
    fi

    echo -n Starting OpsCenter...

    $OPSCENTER_HOME/bin/opscenter > $OPSCENTER_LOGFILE 2>&1 &

    echo OK
}

stop_service() {
    opc_pid=`pgrep -u $USER -f start_opscenter`

    if [ ! -z "$opc_pid" ]; then
        echo Stopping OpsCenter.

        kill -9 $opc_pid
    fi

    a_pid=`pgrep -u $USER -f datastax`

    if [ ! -z "$a_pid" ]; then
        echo Stopping agent.

        kill -9 $a_pid
    fi

    cass_pid=""

    if [ -e $CASS_PIDFILE ]; then
        cass_pid=`cat $CASS_PIDFILE`
    fi

    if [ ! -z "$cass_pid" ]; then
        echo Stopping Cassandra

        kill $cass_pid

        rm -f $CASS_PIDFILE
    fi
}

service_status() {
    if [ -e $CASS_PIDFILE ]; then
        echo Cassandra is running PID `cat $CASS_PIDFILE`.
    else
        echo Cassandra is not running.
    fi

    pid=`pgrep -u $USER -f datastax`

    if [ -z "$pid" ]; then
        echo Agent is not running.
    else
        echo Agent is running PID $pid.
    fi

    pid=`pgrep -u $USER -f start_opscenter`

    if [ -z "$pid" ]; then
        echo OpsCenter is not running.
    else
        echo OpsCenter is running PID $pid.
    fi
}

usage() {
    echo "
cassandra-service usage:

cassandra-service start|stop|status
    "

    exit 1
}

if [ -z "$1" ]; then
    usage
fi

set -e

case "$1" in
    start)
        start_service

        ;;

    stop)
        stop_service

        ;;

    status)
        service_status

        ;;

    *)
        echo Unknown command \"$1\"

        usage

        ;;
esac